The Northrop T-38 Talon is a two-seat, twin-engine supersonic jet trainer. It was the world's first supersonic trainer and is also the most produced. The T-38 remains in service in air forces throughout the world. The United States Air Force (USAF) is the largest operator of the T-38. In addition to training USAF pilots, the T-38 is used by NASA, the USAF Test Pilot School and the US Naval Test Pilot School. The aircraft is powered by two General Electric J-85 afterburning engines. Maximum weight is 12,500 lbs. The aircraft’s service ceiling is in excess of 50,000 ft and the load factor limits are +7.33/-3 g’s. The aircraft is equipped with Northop ejection seats.